The effect of selenium on sulfur uptake by barley and rice

Mikkelsen, Robert L.; Wan, Hongfu

doi:10.1007/bf00013109

Cited by 69 publications

(32 citation statements)

References 8 publications

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“…Assim, alterações na absorção e no teor de S promovidas pelo Se são esperadas, tal como observado por Smith & Watkinson (1984), Banuelos et al (1990), Mikkelsen & Wan (1990) e Barack & Goldman (1997). No presente estudo, o aumento nas concentrações de selenato aumentou o teor de S em todas as cultivares de alface, tendo a maior concentração proporcionado os maiores teores de S (Figura 2a).…”

Section: Resultsunclassified

Selenato e selenito na produção, nutrição mineral e biofortificação com selênio em cultivares de alface¹

Ramos¹,

Faquin²,

Almeida³

et al. 2011

Rev. Bras. Ciênc. Solo

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Section: Resultsunclassified

Selenato e selenito na produção, nutrição mineral e biofortificação com selênio em cultivares de alface¹

Ramos¹,

Faquin²,

Almeida³

et al. 2011

Rev. Bras. Ciênc. Solo

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“…24,26,27 It has been reported that selenate and sulfate have an antagonistic relationship, because Se metabolism follows the same pattern as S due to the chemical similarity of these two atoms, and the presence of Se can provoke a decline in the S concentration in the plant. 28,29 However, other researchers 18,[23][24][25] suggested that there is a synergism between Se and S, resulting in an accumulation of S and Se in lettuce, as has already been observed before by Mikkelsen and Wan, 30 Pilon-Smits et al 29 and Lyons et al…”

Section: Introductionmentioning

confidence: 82%

“…25,30,51 These not consistent data are due to the Se rates applied in the culture medium, because in a higher sulfur/selenium ratio, the sulfur accumulation is promoted, but for lower ratios, the S concentration is depressed, suggesting a possible antagonistic behavior between these elements. Considering phosphorus, Broyer et al 54 reported that a positive growth response for Se fortification is due to alleviation of P toxicity, since it was much less pronounced when plants were grown at lower phosphorus levels.…”

Section: Minerals Accumulation Pca and Theoretical Calculationsmentioning

confidence: 98%

Effect of Selenite and Selenate Application on Mineral Composition of Lettuce Plants Cultivated Under Hydroponic Conditions: Nutritional Balance Overview Using a Multifaceted Study

Silva¹,

Cidade²,

Heerdt³

et al. 2017

J. Braz. Chem. Soc.

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The effect of selenate and selenite enrichment on mineral composition of a red type of lettuce cv. "Veneza roxa" was evaluated using inductively coupled plasma-optical emission spectroscopy (ICP OES), molecular modeling and principal component analysis (PCA). Both Se species did not show toxicity, while selenate promoted the greatest Se accumulation by the plant. There was an increase of 886 µg of Se per 100 g of fresh sample at different concentrations of selenate, but for selenite the maximum variation was only of 114 µg per 100 g. Selenate promoted the absorption of Mo and S and the reduction of K, Mn and P, meanwhile selenite increased Mn and decreased Mo accumulation. Copper and Fe absorption was negatively affected, Ca and Mg showed a slight increase, and Na and Zn were not affected by Se species. Despite the changes in the nutritional balance, Se-enriched lettuce can still be considered a potential dietary source of this essential element.

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“…Selenium was provided to the plants as selenate, and may have been taken up by the sulfate-uptake system (21,22), although a more specific uptake mechanism cannot be excluded. Our results indicate that the fate of this selenate is quite different in different tissues of the plant, and indeed in different parts of those tissues.…”

Section: Discussionmentioning

confidence: 99%

Quantitative, chemically specific imaging of selenium transformation in plants

Pickering

Prince²,

Salt³

et al. 2000

Proc. Natl. Acad. Sci. U.S.A.

166

156

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Quantitative, chemically specific images of biological systems would be invaluable in unraveling the bioinorganic chemistry of biological tissues. Here we report the spatial distribution and chemical forms of selenium in Astragalus bisulcatus (two-grooved poison or milk vetch), a plant capable of accumulating up to 0.65% of its shoot dry biomass as Se in its natural habitat. By selectively tuning incident x-ray energies close to the Se K-absorption edge, we have collected quantitative, 100-m-resolution images of the spatial distribution, concentration, and chemical form of Se in intact root and shoot tissues. To our knowledge, this is the first report of quantitative concentration-imaging of specific chemical forms. Plants exposed to 5 M selenate for 28 days contained predominantly selenate in the mature leaf tissue at a concentration of 0.3-0.6 mM, whereas the young leaves and the roots contained organoselenium almost exclusively, indicating that the ability to biotransform selenate is either inducible or developmentally specific. While the concentration of organoselenium in the majority of the root tissue was much lower than that of the youngest leaves (0.2-0.3 compared with 3-4 mM), isolated areas on the extremities of the roots contained concentrations of organoselenium an order of magnitude greater than the rest of the root. These imaging results were corroborated by spatially resolved x-ray absorption near-edge spectra collected from selected 100 ؋ 100 m 2 regions of the same tissues. Selenium is now known to play essential metabolic roles in most or perhaps all eukaryotes (1), but its toxic properties were recognized earlier in the poisoning of range animals eating selenium-hyperaccumulating plants (2). Hyperaccumulating plants actively and specifically accumulate high levels of metal or metalloid compounds into their tissues (3), and there is considerable interest in the biochemical mechanisms of hyperaccumulation, particularly with regard to potential phytoremediation strategies for contaminated environments (4) and for use as dietary supplements or ''nutraceuticals'' (5). The two-grooved milk-or poison-vetch, Astragalus bisulcatus, also known by cattle ranchers as ''locoweed,'' hyperaccumulates up to 0.65% of its shoot dry biomass as Se (6) from inorganic selenium naturally present in soil in parts of its range. The major Se-containing compound in the leaves is Se-methylselenocysteine, with smaller amounts of selenocystathione and ␥-glutamyl-Se-methylselenocysteine localized in the seed pods (7). Other organoselenium compounds are also produced but in smaller amounts (dimethyldiselenide in particular is clearly indicated by its characteristic odor). The purification, cloning, and characterization of a specific selenocysteine methyltransferase involved in synthesizing Se-methylselenocysteine from selenocysteine and S-methylmethionine has recently been reported (8). Despite this progress, much remains to be learned about the details of Se uptake, transport, and storage in hyperaccumulating plants. X-ray ...

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The effect of selenium on sulfur uptake by barley and rice

Cited by 69 publications

References 8 publications

Selenato e selenito na produção, nutrição mineral e biofortificação com selênio em cultivares de alface¹

Selenato e selenito na produção, nutrição mineral e biofortificação com selênio em cultivares de alface¹

Effect of Selenite and Selenate Application on Mineral Composition of Lettuce Plants Cultivated Under Hydroponic Conditions: Nutritional Balance Overview Using a Multifaceted Study

Quantitative, chemically specific imaging of selenium transformation in plants

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